Precious Metal PtRu10-H04
Supply condition
H04 = full hard
Choose for maximum wear resistance on sliding contacts and probe/brush wire where forming is minimal.
Values for the H04 condition
Other PtRu10 tempers and conditions
PtRu10 is listed in 5 conditions; see the grade overview at PtRu10.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault soft, fully recrystallised strip/wire | Standard supply condition for deep-drawn contact rivets, formed spring blanks and further cold working. | 250 | 520 | 28 | 133 HB | 4 % IACS |
Quarter hard | Light temper for parts needing better stiffness than soft while still allowing moderate bending. | 450 | 650 | 15 | 176 HB | 3.9 % IACS |
Half hard | Balanced temper for relay blades and slip-ring brush strip needing elastic response plus some formability. | 620 | 780 | 8 | 18 HRC | 3.9 % IACS |
H04This page Full hard | Choose for maximum wear resistance on sliding contacts and probe/brush wire where forming is minimal. | 820 | 930 | 3 | 24 HRC | 3.9 % IACS |
Spring hard | Highest-strength temper for fine spring contact wire, probe tips and potentiometer brushes. | 950 | 1,050 | 2 | 28 HRC | 3.8 % IACS |
What is PtRu10-H04?
PtRu10-H04 is PtRu10 supplied in the H04 condition — choose for maximum wear resistance on sliding contacts and probe/brush wire where forming is minimal. PtRu10-H04 has a yield strength of 820 MPa (119 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 100% of precious metal grades. Elongation at break is 3% and the elastic modulus is 200 GPa (29 Msi). PtRu10-H04 has a density of 20 g/cm³ (0.723 lb/in³), heavier than 93% of precious metal grades. It melts at 1,780°C (3,236 °F). Annealed is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- High strength — 820 MPa (119 ksi), better than 100% of precious metal grades
- Stiff — 200 GPa (29 Msi), better than 97% of precious metal grades
- Good corrosion resistance — 96/100, better than 85% of precious metal grades
Limitations
- Low electrical conductivity — 3.9 % IACS, worse than 100% of precious metal grades
- Poor heat conductor — 21.5 W/m·K (12.4 BTU/hr·ft·°F), worse than 99% of precious metal grades
- Limited formability — 20/100, worse than 96% of precious metal grades
- Limited ductility — 3%, worse than 95% of precious metal grades
- Heavy — 20 g/cm³ (0.723 lb/in³), worse than 93% of precious metal grades
PtRu10-H04 properties
Typical room-temperature values for PtRu10-H04; 20 are specific to this condition. Other listed values are PtRu10 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
PtRu10-H04 has a density of 20 g/cm³ (0.723 lb/in³), heavier than 93% of precious metal grades. It melts at 1,780°C (3,236 °F).
Mechanical13
PtRu10-H04 has a yield strength of 820 MPa (119 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 100% of precious metal grades. Elongation at break is 3% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
PtRu10-H04 is rated for continuous service to 200°C (392 °F). It conducts heat at 21.5 W/m·K (12.4 BTU/hr·ft·°F), worse than 99% of precious metal grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
PtRu10-H04 conducts electricity at 3.9 % IACS, worse than 100% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (96/100), better than 85% of precious metal grades.
Sustainability4
Producing a kilogram of PtRu10-H04 takes about 220,000 MJ of energy and emits 13,500 kg of CO₂ — more than 89% of precious metal grades. Typical recycled content is 40%.
Manufacturability8
PtRu10-H04's machinability is fair (40/100, worse than 60% of precious metal grades); weldability good (55/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PtRu10-H04
Is PtRu10 easy to machine?
Gummy and rapidly work-hardening — use sharp carbide/PCD tooling, positive rake, high speed with light steady feeds, and collect all swarf for refining.
Can PtRu10 be welded?
Readily resistance-, laser- or micro-TIG welded to contact carriers and Ni/Cu leads; braze with Au- or Pd-bearing fillers, avoid Pb/Sn contamination.
Can PtRu10 be formed, bent or molded?
Cold rolls and draws well from the annealed state but hardens fast — interstage anneal at 900–1100 °C in air or inert gas every 40–60 % reduction.
What surface finishes work on PtRu10?
Takes an excellent mirror polish; no plating or passivation needed, but ultrasonic clean to remove organics that could raise contact resistance.
PtRu10 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Rusolid-solution hardener | 9.5 – 10.5 | 10 |
| Other PGM + impuritiesIr/Pd/Rh + Fe, Cu, Pb total | ≤ 0.1 | 0.05 |
| Pttypically 99.95 % purity base | balance | — |
PtRu10-H04 — frequently asked
What is PtRu10-H04 used for?
PtRu10-H04 is typically used for precision relay contacts, slip rings, potentiometer contacts and aerospace switch contacts. In short: hardened platinum contact alloy; 500 °C service capability; available in spring temper.
What is the yield strength of PtRu10-H04?
PtRu10-H04 has a typical yield strength of 820 MPa (119 ksi) and a tensile strength of 930 MPa (135 ksi) — stronger than 100% of precious metal grades. Strength varies by condition: see the 5 listed tempers.
Is PtRu10-H04 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% of precious metal grades). Gummy and rapidly work-hardening — use sharp carbide/PCD tooling, positive rake, high speed with light steady feeds, and collect all swarf for refining.
Can PtRu10-H04 be welded?
Yes — weldability is rated good (55/100). Readily resistance-, laser- or micro-TIG welded to contact carriers and Ni/Cu leads; braze with Au- or Pd-bearing fillers, avoid Pb/Sn contamination.
What surface finishes work on PtRu10-H04?
Takes an excellent mirror polish; no plating or passivation needed, but ultrasonic clean to remove organics that could raise contact resistance.
Can PtRu10-H04 be formed, bent or molded?
Cold rolls and draws well from the annealed state but hardens fast — interstage anneal at 900–1100 °C in air or inert gas every 40–60 % reduction.
What is the maximum service temperature of PtRu10-H04?
PtRu10-H04 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between PtRu10 Annealed and PtRu10 Spring?
Annealed is the default condition — standard supply condition for deep-drawn contact rivets, formed spring blanks and further cold working. Spring: highest-strength temper for fine spring contact wire, probe tips and potentiometer brushes. Yield strength is 250 MPa in Annealed versus 950 MPa in Spring.
Sources
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Precious Metals) — ASM International (1990)
- Platinum alloys for electrical contacts — Pt-Ru data — Johnson Matthey (2020)
- ASM Alloy Phase Diagrams — Pt-Ru system — ASM International (2016)
- ASTM B685 / B684 — Platinum and platinum alloy wire and strip — ASTM (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.